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    <script>
        // 2.[2,5,8,9,2,2,2,3,3] 删除重复的
        let arr = [2, 5, 8, 9, 2, 2, 2, 3, 3];
        let arr1 = [];
        for (let i = 0; i < arr.length; i++) {
            if (arr[i] != 2) {
                arr1.unshift(arr[i]);
            }
        }
        console.log(arr1);
    </script>
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